NAME
Refinements - safer monkey-patching; Ruby-2.0-style refinements for Perl
SYNOPSIS
BEGIN {
package LwpDebugging;
use Refinements;
refine 'LWP::UserAgent::request' => sub
{
my $next = shift; # like Moose's "around" modifier
my $self = shift;
warn sprintf 'REQUEST: %s %s', $_[0]->method, $_[0]->uri;
return $self->$next(@_);
};
};
{
package MyApp;
use LWP::UserAgent;
my $ua = LWP::UserAgent->new;
my $req = HTTP::Request->new(GET => 'http://www.example.com/');
{
use LwpDebugging;
my $res = $ua->request($req); # issues debugging warning
# $ua->get internally calls $ua->request
my $res2 = $ua->get('http://www.example.org/'); # no warning
}
my $res = $ua->request($req); # no warning
}
DESCRIPTION
Refinements allows you to define Ruby-2.0-style refinements. Refinements
are a lexically-scoped monkey-patch. In the SYNOPSIS example, we're using
a refinement that overrides LWP::UserAgent's `request` method. The
refinement only gets applied in the small block of code where `use
LwpDebugging` appears. Calling the `request` method from outside that
block ignores the refinement. Refinements are lexically-scoped rather than
dynamically-scoped.
Refinements can be used to add or override aspects of a class' behaviour,
as an alternative to subclassing.
Credit where it's due: all the hard work is done by Method::Lexical. The
Refinements module just provides an interface to Method::Lexical that may
be more comfortable to many users. Defining a refinement becomes much like
defining method modifiers in Moose or Moo.
In particular, the Refinements module does a two things:
1. It makes your package inherit from Refinements::Package; and
2. It exports a convenience function `refine` to your package.
Functions
The following function is exported:
`refine(@names, $coderef)`
This is roughly equivalent to:
$your_package->add_refinement($_, $coderef) for @names;
See "Methods" in Refinements::Package for further information on the
`add_refinement` method.
BUGS
Please report any bugs to
.
SEE ALSO
Refinements::Package, Method::Lexical.
AUTHOR
Toby Inkster .
COPYRIGHT AND LICENCE
This software is copyright (c) 2013 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under the
same terms as the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.